您可以使用javascript的toFixed方法(

You can use javascript's toFixed method (source), you don't need jQuery. Example:

var number = 258.2;    
var rounded = number.toFixed(2); // rounded = 258.20

电动工具箱"链接已屈服于linkrot并阻止了Wayback Machine，因此该源没有可用的URL.

Electric Toolbox link has succumbed to linkrot and blocks the Wayback Machine so there is no working URL for the source.